Light-Guide Plate Attachment Member for Glare Without Image Darkening
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Solution Overview
Problem
Electronic devices with reflective displays using a light-guide plate experience glare and reduced light-guide effect due to the use of ordinary attachment members that fill the dots of the light-guide plate, leading to darkened images.
Innovation Solution
The use of an attachment member with a loss tangent (tan δ) at 30°C greater than 0 and less than or equal to 1, separated from optical units by a gap, and designed with specific thickness and transmittance properties to minimize interference with light-guide functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If an ordinary attachment member is used to bond the light-guide plate and adjacent components in full-surface bonding, then anti-glare properties are improved, but the attachment member fills the dots of the light-guide plate which darkens the image and reduces light-guide effect
Solution Approach 1:
The attachment member is designed with spatially varying properties: it has different loss tangent values in different regions, with higher loss tangent areas positioned to contact the dots of the light-guide plate and lower loss tangent areas positioned away from the dots. This local differentiation allows the attachment member to provide anti-glare protection where needed while preserving light transmission where required for the light-guide effect.
Solution Approach 2:
The attachment member serves as an intermediary between the light-guide plate and adjacent components, with its optical properties carefully engineered to mediate between two conflicting requirements: providing anti-glare protection through full-surface bonding while maintaining light transmission through the dots. The specific loss tangent range (0.01-0.5) acts as a mediator that balances light absorption for glare reduction with light transmission for image brightness.
2Object-affected harmful factors
If an attachment member with high loss tangent is used to reduce glare, then anti-glare properties are improved, but the light-guide effect is reduced and image darkens
Solution Approach 1:
The attachment member incorporates spatially differentiated loss tangent values, with higher values (0.1-0.5) in regions contacting the dots for glare reduction, and lower values (0.01-0.1) in regions away from dots for preserving light-guide effect. This local quality variation resolves the contradiction by applying different optical properties where needed.
Solution Approach 2:
The invention changes the optical parameter (loss tangent) of the attachment member within a specific range (0.01-0.5) to achieve optimal balance between glare reduction and light-guide effect preservation. By controlling the loss tangent parameter rather than using extreme values, the invention maintains reliability of the light-guide effect while still providing anti-glare protection.
Data Source
AI summary
An electronic device is provided. The electronic device includes a panel, a light-guide plate and an attachment member. The light-guide plate is disposed on the panel. The light-guide plate has a first surface with a plurality of optical units. The attachment member contacts a part of the first surface of the light-guide plate. The loss tangent (tan δ) at 30° C. of the attachment member is greater than 0 and less than or equal to 1.